linux-kernel - Re: [bisected] pre-3.16 regression on open() scalability

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Date:	Thu, 19 Jun 2014 16:16:34 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
cc:	Andi Kleen <ak@...ux.intel.com>,
	Dave Hansen <dave.hansen@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Josh Triplett <josh@...htriplett.org>,
	"Chen, Tim C" <tim.c.chen@...el.com>
Subject: Re: [bisected] pre-3.16 regression on open() scalability

This looks very much like the CONFIG_PREEMPT problem in not so
extreme form. Maybe we need to add another config option:

CONFIG_REALLY_REALLY_NO_PREEMPT

to get the fastest code possible and those cond_rescheds removed from the
critical paths?

Or better

CONFIG_PREEMPT_HALF_WAY

to enable those cond_rescheds.

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